An electrostatic voltmeter has two parallel circular plates. The mobile plate is 10 cm in diameter. With 10 KV between the plates the pull force is 5*10^-3 N. Determine the change in capacitance for a movement of 1mm of the mobile plate? and what is the law for this question.

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Dielectric Constant Of Water

Water constitutes about 70% of earth.  Some important distinguishing properties of water are high molar concentration, small dissociation constant and high dielectric constant.

Electrostatic Potential and Capacitance

An electrostatic force is a force caused by stationary electric charges /fields. The electrostatic force is caused by the transfer of electrons in conducting materials. Coulomb’s law determines the amount of force between two stationary, charged particles. The electric force is the force which acts between two stationary charges. It is also called Coulomb force.